onsemi SS9014CTA

Overview

SS9014CTA from Fairchild Semiconductor is an NPN epitaxial silicon transistor designed for low-noise pre-amplifier and small-signal amplification applications, with hFE classification C (200–600), VCEO = 45 V, IC = 100 mA, PC = 450 mW, and fT = 150–270 MHz. It operates in TO-92 package and is commonly used in audio preamps and signal conditioning stages.

For engineers reviewing the SS9014CTA datasheet, pinout, applications, or equivalent options, key selection criteria include DC current gain range, noise figure at 1 kHz, saturation voltages at IC = 100 mA/IB = 5 mA, output capacitance, and thermal limits for continuous biasing in linear amplifier designs.

Technical Context

The SS9014CTA is a general-purpose NPN bipolar junction transistor optimized for low-noise, high-linearity small-signal amplification. Its hFE classification C ensures consistent DC gain between 200 and 600 at VCE = 5 V and IC = 1 mA, supporting stable biasing in Class-A preamp topologies.

It features low VBE(sat) = 0.84–1.0 V and VCE(sat) = 0.14–0.3 V under IC = 100 mA/IB = 5 mA conditions, enabling efficient operation in low-voltage analog stages. Cob = 2.2–3.5 pF and NF = 0.9–10 dB at f = 1 kHz further confirm its suitability for audio-frequency signal paths.

Key Specifications

Pinout & Package

SS9014CTA is housed in a standard TO-92 plastic package with lead spacing of 1.27 mm (0.050"), body length 4.58 mm, and overall height 3.86 mm. Pin 1 is Emitter, Pin 2 is Base, Pin 3 is Collector - verified per Fairchild Rev. A4 datasheet and JEDEC TO-92 outline.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar small-signal NPN transistor applications.

Compared with BC547C and 2N3904, the SS9014CTA offers superior low-noise performance and guaranteed hFE ≥200 in its C grade, making it more suitable for analog signal chains demanding both gain consistency and SNR preservation - especially where VCEO ≥45 V and Cob ≤3.5 pF are design constraints.

Availability

SS9014CTA is available at Aetrix Electronics and suitable for audio pre-amplifier circuits, sensor signal conditioning modules, and low-power oscillator designs requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for SS9014CTA includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.

The SS9014CTA belongs to Fairchild's legacy general-purpose transistor family, engineered specifically for low-noise, high-linearity small-signal amplification in consumer audio and industrial sensing applications.

FAQ

What is the hFE classification for SS9014CTA?

The SS9014CTA is classified as hFE grade C, meaning its DC current gain is guaranteed between 200 and 600 when measured at VCE = 5 V and IC = 1 mA. This classification is explicitly defined in the Fairchild SS9014 datasheet Rev. A4 and distinguishes SS9014CTA from variants like SS9014ATA (grade A) and SS9014DTA (grade D). The C grade provides optimal balance of gain and consistency for linear amplifier designs.

What is the maximum collector current rating for SS9014CTA?

The SS9014CTA has a maximum continuous collector current rating of 100 mA at Ta = 25°C, as specified in the Absolute Maximum Ratings table. Derating is required above 25°C ambient - approximately 3.3 mA/°C above that point - to maintain junction temperature below 150°C. This rating supports reliable operation in pre-amplifier and low-duty-cycle switching roles, but not sustained high-current loads.

Is SS9014CTA pin-compatible with other TO-92 NPN transistors?

SS9014CTA uses standard TO-92 pinout (Emitter-Base-Collector = Pin 1-2-3), matching industry convention and ensuring mechanical compatibility with sockets and footprints for BC547, 2N3904, and PN2222A. However, electrical characteristics - particularly hFE range, noise figure, and saturation voltages - differ significantly; direct substitution requires verification of gain, noise, and thermal requirements in the target circuit.

What is the typical noise figure of SS9014CTA and under what conditions is it measured?

The SS9014CTA has a noise figure ranging from 0.9 dB to 10 dB, measured at VCE = 5 V, IC = 0.2 mA, f = 1 kHz, and RS = 2 kΩ. This low-noise performance is confirmed in the Electrical Characteristics table and makes the SS9014CTA especially suitable for microphone pre-amplifier inputs and other low-level analog signal paths where preserving signal-to-noise ratio is critical.

Does SS9014CTA have a complementary PNP counterpart?

Yes, the SS9014CTA has a designated complementary PNP counterpart: the SS9015. Both share identical TO-92 packaging, voltage ratings (VCEO = –45 V for SS9015), and hFE grading structure (e.g., SS9015CTA is grade C), enabling matched pair usage in push-pull output stages, differential amplifiers, and balanced oscillator designs - as explicitly noted in the Fairchild SS9014 datasheet.